/*	$OpenBSD: fchmod.c,v 1.2 2021/12/01 17:25:35 kettenis Exp $	*/
/*	$NetBSD: stat.c,v 1.3 1994/10/26 05:45:07 cgd Exp $	*/

/*-
 * Copyright (c) 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)stat.c	8.1 (Berkeley) 6/11/93
 */

#include "stand.h"

int
fchmod(int fd, mode_t m)
{
	struct open_file *f = &files[fd];

	if (f->f_ops->fchmod == NULL) {
		errno = EOPNOTSUPP;
		return (-1);
	}
	if ((unsigned)fd >= SOPEN_MAX || f->f_flags == 0) {
		errno = EBADF;
		return (-1);
	}

	/* operation not defined on raw devices */
	if (f->f_flags & F_RAW) {
		errno = EOPNOTSUPP;
		return (-1);
	}
	/* writing is broken or unsupported */
	if (f->f_flags & F_NOWRITE) {
		errno = EOPNOTSUPP;
		return (-1);
	}

	errno = (f->f_ops->fchmod)(f, m);
	return (0);
}